Key points are not available for this paper at this time.
This paper deals with a detailed study of horizons during the gravitational collapse of dust and viscous fluids, under the assumptions of spherical symmetry. The formation and time evolution of collapsing shells, spherically symmetric marginally trapped tubes, as well as the event horizon are determined and compared through analytical and numerical techniques. Using different density profiles of matter, we analyze how the nature of these marginally trapped surfaces modify as we change the energy-momentum tensor. These studies reveal that depending on the mass function and the mass profile, it is possible to envisage situations where dynamical horizons, timelike tubes, or isolated horizons arise.
Chatterjee et al. (Wed,) studied this question.